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Diffstat (limited to 'dts/Bindings/pinctrl/nvidia,tegra-pinmux-common.yaml')
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diff --git a/dts/Bindings/pinctrl/nvidia,tegra-pinmux-common.yaml b/dts/Bindings/pinctrl/nvidia,tegra-pinmux-common.yaml new file mode 100644 index 0000000000..96c608bcb8 --- /dev/null +++ b/dts/Bindings/pinctrl/nvidia,tegra-pinmux-common.yaml @@ -0,0 +1,178 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pinctrl/nvidia,tegra-pinmux-common.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: NVIDIA Tegra Pinmux Controller + +maintainers: + - Thierry Reding <thierry.reding@gmail.com> + - Jonathan Hunter <jonathanh@nvidia.com> + +description: | + Please refer to pinctrl-bindings.txt in this directory for details of the + common pinctrl bindings used by client devices, including the meaning of + the phrase "pin configuration node". + + Tegra's pin configuration nodes act as a container for an arbitrary number + of subnodes. Each of these subnodes represents some desired configuration + for a pin, a group, or a list of pins or groups. This configuration can + include the mux function to select on those pin(s)/ group(s), and various + pin configuration parameters, such as pull-up, tristate, drive strength, + etc. + + The name of each subnode is not important; all subnodes should be + enumerated and processed purely based on their content. + + Each subnode only affects those parameters that are explicitly listed. In + other words, a subnode that lists a mux function but no pin configuration + parameters implies no information about any pin configuration parameters. + + Similarly, a pin subnode that describes a pullup parameter implies no + information about e.g. the mux function or tristate parameter. For this + reason, even seemingly boolean values are actually tristates in this + binding: unspecified, off, or on. Unspecified is represented as an absent + property, and off/on are represented as integer values 0 and 1. + + Note that many of these properties are only valid for certain specific pins + or groups. See the Tegra TRM and various pinmux spreadsheets for complete + details regarding which groups support which functionality. The Linux + pinctrl driver may also be a useful reference, since it consolidates, + disambiguates, and corrects data from all those sources. + +properties: + nvidia,pins: + $ref: /schemas/types.yaml#/definitions/string-array + description: An array of strings. Each string contains the name of a pin + or group. Valid values for these names are listed below. + + nvidia,function: + $ref: /schemas/types.yaml#/definitions/string + description: A string containing the name of the function to mux to the + pin or group. Valid values for function names are listed below. See the + Tegra TRM to determine which are valid for each pin or group. + + nvidia,pull: + description: Pull-down/up setting to apply to the pin. + $ref: /schemas/types.yaml#/definitions/uint32 + oneOf: + - description: none + const: 0 + - description: down + const: 1 + - description: up + const: 2 + + nvidia,tristate: + description: Tristate setting to apply to the pin. + $ref: /schemas/types.yaml#/definitions/uint32 + oneOf: + - description: drive + const: 0 + - description: tristate + const: 1 + + nvidia,schmitt: + description: Enable Schmitt trigger on the input. + $ref: /schemas/types.yaml#/definitions/uint32 + oneOf: + - description: disable Schmitt trigger on the input + const: 0 + - description: enable Schmitt trigger on the input + const: 1 + + nvidia,pull-down-strength: + description: Controls drive strength. 0 is weakest. The range of valid + values depends on the pingroup. See "CAL_DRVDN" in the Tegra TRM. + $ref: /schemas/types.yaml#/definitions/uint32 + + nvidia,pull-up-strength: + description: Controls drive strength. 0 is weakest. The range of valid + values depends on the pingroup. See "CAL_DRVUP" in the Tegra TRM. + $ref: /schemas/types.yaml#/definitions/uint32 + + nvidia,high-speed-mode: + description: Enable high speed mode the pins. + $ref: /schemas/types.yaml#/definitions/uint32 + oneOf: + - description: normal speed mode + const: 0 + - description: high speed mode + const: 1 + + nvidia,low-power-mode: + description: Controls the drive power or current. Valid values are from 0 + through 3, where 0 specifies the least power and 3 specifies the most + power. See "Low Power Mode" or "LPMD1" and "LPMD0" in the Tegra TRM. + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [ 0, 1, 2, 3 ] + + nvidia,enable-input: + description: Enable the pin's input path. + $ref: /schemas/types.yaml#/definitions/uint32 + oneOf: + - description: disable input (i.e. output only) + const: 0 + - description: enable input + const: 1 + + nvidia,open-drain: + description: Open-drain configuration for the pin. + $ref: /schemas/types.yaml#/definitions/uint32 + oneOf: + - description: disable open-drain + const: 0 + - description: enable open-drain + const: 1 + + nvidia,lock: + description: Lock the pin configuration against further changes until + reset. + $ref: /schemas/types.yaml#/definitions/uint32 + oneOf: + - description: disable pin configuration lock + const: 0 + - description: enable pin configuration lock + const: 1 + + nvidia,io-reset: + description: reset the I/O path + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [ 0, 1 ] + + nvidia,rcv-sel: + description: select VIL/VIH receivers + $ref: /schemas/types.yaml#/definitions/uint32 + oneOf: + - description: normal receivers + const: 0 + - description: high-voltage receivers + const: 1 + + nvidia,drive-type: + description: Drive type to configure for the pin. + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [ 0, 1, 2, 3 ] + + nvidia,io-hv: + description: Select high-voltage receivers. + $ref: /schemas/types.yaml#/definitions/uint32 + oneOf: + - description: Use normal receivers. + const: 0 + - description: Use high-voltage receivers. + const: 1 + + nvidia,slew-rate-rising: + description: Controls rising signal slew rate. 0 is fastest. The range of + valid values depends on the pingroup. See "DRVDN_SLWR" in the Tegra TRM. + $ref: /schemas/types.yaml#/definitions/uint32 + + nvidia,slew-rate-falling: + description: Controls falling signal slew rate. 0 is fastest. The range of + valid values depends on the pingroup. See "DRVUP_SLWF" in the Tegra TRM. + $ref: /schemas/types.yaml#/definitions/uint32 + +additionalProperties: true +... |